SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6e7f7ccbce659f52f431f2f4081085667d0248cfb2b0cba55f612c326fbdc82' 
  AND token = 'ClyogENX3PI29lDFSBNXw3wFth+G6jpyVRHYXH2dnUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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