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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a55535ce36ff2adb590c89a246bc4c05011f80b6d9d94e8ec60ff01b9dc7975' 
  AND token = 'TOcC84d+tJf3QPBQx6pIbQhoMTF7mfPe9qgcZii+bkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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