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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14e5fbbb015dd59423b71d711959902af552eb5e3ac082167dfc72f46edfe475' 
  AND token = '+3vtB8GcD18pTs7CVY9dhbJbENU2Ts4x0zFKVUra0cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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