SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bf86953c654654599ebf23c53549dc3e342a31b1c684680a13fb33be8dfdadc' 
  AND token = 'sPQzi99l0mmTQ0MWPVp+mGojF/0KqSVMoOcgIYrO3KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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