SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63235db0e7abd82d0401b3eaa18266f715c0b37674a1292bff5f54b0473d898a' 
  AND token = 'SrQRS5KsyYdqsdGmKQxKnPcJLYloxvdm99IDX9ELRX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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