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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c30ba5411132a50f58bcaebf9b9219e2afe28b1713dbc470f0809137e2418d6' 
  AND token = 'dtKcD7ugt75G6yDMn5BedwgCpwa1Kbx6MFxW+ojFYtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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