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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '419b56c4db76c134402b13d07f6e05c109be17463e4cf4c526bd8aab166250d4' 
  AND token = '5GTPIr7xT0gWh26T2vhq/nWBdkh3+Gh4AFyDTw3awKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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