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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a094e35f0e0f41566a9c33caf05cdf6126e8ba695e98f997e176f7a66c16c164' 
  AND token = 'NdDGRoLU+/eVWvbFdZvlIrIMvRxkDO905jDML9HMjIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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