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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1617d2cde8643a07240775364e269e69be02636354609d5595b9bc97cbc3b1eb' 
  AND token = 'dqVMY7D9Zp2i7KlmcT87QSHeEdufydsV+D6uf0JHyU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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