SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1127f63317456550e8e572a2776eba95ffdd138f64878a5517c97b781df6c3e' 
  AND token = 'Cg6uTPjjl+wxrR4hHrgh8Ez3+b69y/Ns6PA0+WjwOlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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