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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63e90fa9a2b43ba1827e3b0ad48ab330dcfe523c4c7daaea551a12a6f47b0f20' 
  AND token = 'RBGbKuzH1kOEbOBausuTsfBjCG7ZbHQuA5sjAfzoYks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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