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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efb7ed39f231ccf8db474e0d497776263f60b84c8af6b7e9cd72e37b626ed485' 
  AND token = 'dOadO6c4i601v4UJ724bLn5/hVcBxG8y1v79j9xSI2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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