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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a099e02a8b4a83fad12039ff849ab97d7b3a9f8ea0e601be77820e1be9ed09b1' 
  AND token = 'JJwoeXEv+S5RsCEEMWAHXEly34+icKUmbVjlSdwRojc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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