SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24e8231750353db601f23b42ab606ff31a6b11d4b38f2784c039e5331251a746' 
  AND token = 'sEuzxkJQUHwIzStHxIsGM7GvbLNCmX8/+/SzpV+RD24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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