SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d1822ecefe56e0402fdd9d11f3f2b5275e73572cc38785bd64fd9d71a56271a' 
  AND token = 'LSM1OwPimPCRmDjygFztU/o5DpBFJJXdaoxv1F4fWzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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