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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eed8ff25203775c5185b48b5c84bd8872489b4aacd6143c79794db355b12f0e1' 
  AND token = 'j2u73bNMPRmUGpbFp4VASJjXtLOF1DO6YFBklSo2tzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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