SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd90cde9167e114dc93492d1929b72250c23d5a632b86dda8e2908d8f05ffd303' 
  AND token = 'UEMGcWf3V/h6V+F7ROMwCa+5+XnozNvOwdCZfHCwezs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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