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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11d57692bed598aa67ca29bf3b524cc9e27d31a1064446b2b1c60a35e82ffa5a' 
  AND token = 'qWgn0SLqoTO1MeLOTs5lOt27PHnpc977NQoUmem5Cz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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