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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ec926d486851c8b08b2368f77629b034399cc8b1201c74d9ed6af970dfa8e86' 
  AND token = 'FACsoPlAVkqZhPDXggMkWb6fls9oRCC3eO+iEyNT+mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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