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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2aab6e40548c3dff4ba4ec95fea85a67471cb4a113cd27be704a70820d09f65' 
  AND token = '8b8gnUzfDAehNiV2DR8z5iGUKhp3yyS55RaKYtFtu+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}