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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd83cf5a23fde1eceb6344655488b25d688e55208aef6ec60b3d09b25420b3802' 
  AND token = 'u4MgHN9GmKc23tnDP2ZzTI/K+JXZQy+Pk/F82Weiyw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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