SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bcd9d6f8cc4fdcdfb8d815156166e5fe099b4f3db128881c801eb3bc5f9f97d' 
  AND token = '34SpQAG0NX8QHt9WWGIufkPCpgU7Ww12zEVjqh5BDwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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