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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9728927b04e7643d518625d1c9d055b4dc774a9d2059c4bc8c92586ac5b5d9df' 
  AND token = 'q2PxbVfvBfT6VQWniVvb9HFW8D2yZxF9wSyWP7Qkngw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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