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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abd53db79eee6d0f1f9043ae9cdf1e355c37d886d409f7864f76a6f130f3014e' 
  AND token = '358DgtuKG8MW2HUlFbsBcl5JOQdFnq9CT1afD5zBhk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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