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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60ad7e0fcb67a5b3faadc86319c41431ab5bb137510b83c457c21cbcf2083f2c' 
  AND token = '2ZgKqxrBM9DhVArvvd36S3hdv2a4ko7Ptsu1dSdL5To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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