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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41dbbd2b4723fa8b5f3b48d31392b439d7dcb824b615f31b6e6f6bc40422af43' 
  AND token = 'MJqXdlKwMqhWcKA7g9Iw8v05Y9qkudiv14SPccS8hAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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