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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4268c5c9e6ba9926ef73235caf07437bd0af4f29917358d649d0dcd53e9e9f9f' 
  AND token = 'K8aDO8WlyprFEcg+X6p1+OAxSOG9GcSh/Q4MLJ4uB4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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