SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa1763df8f6ae446524b3ad5924da87e85ad11f61641c3b4ef86e2c94ad3f751' 
  AND token = 'EE5xvDvWCbFCwgFIaoUBBiZDy8Q9YuujG+SKUKwrr9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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