SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09cf847a770fec9a1b5c5eae0e754d4423826b70a5c79e9b401f1a179d14f98e' 
  AND token = 'ZLrfTCigIU//+3m5twDQ6+qKztY7EuFdlMOY/BFV6Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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