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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f8127491f314c695aee8fcb609f978e8094439d36871928159233e116d07bc7' 
  AND token = 'EBC0GyryLUk9XSJ4Uw+oL159TbNg3fe6V6mAlZ8znjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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