SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7540d577c9c86d52765b01d7353327b16969841d1c39498aa5e68f7c443b1f2a' 
  AND token = 'hZyXWHe25JqCpjr7EKbXc5kSI2lRJ2Y8cPGKFzukfzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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