SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a725b6f29a76074dbd94e9ea640dd46c874e8bc6ba8c199d91320126b906443' 
  AND token = 'k/1zFUlUaYm0wIfl1NJtPh5FPdRKIyANg9KvzViCEBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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