SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f48c27f66279f482677c756fe1137474f33212eff667859ae49874f29dbb6c1b' 
  AND token = '9dm3YGVqQpEd67GK7avcWYcXeKB/P8aVLJ3353qx09w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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