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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83f7fae455dad3e8792f5e94c9416b3fb6140a18cb94be4d34c53eed60a179f1' 
  AND token = 'Bsb3ivBX3JCoJggxMxSuDVi8CeQXI7dpbdJRSHqB0NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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