SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba35768969fa02b28e6a9214737e50b7e354e4ef719fa60fab57511766736abb' 
  AND token = 'CVDJqVLta5KSuh742pQlO+oxMDxTxBec/Is1vXYUWXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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