SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '926e1b186f3d2f2a642fa14ed1ca59599c0f03145dd390cc78c09de1c94b280f' 
  AND token = '1qSZ0YAU5lUr7qGQjwny/VimJdq2ellqMO5lrhqa/YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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