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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb6796e6eb63047662f09afeb3578ad021c6216db44febd657a8f7c8044a4949' 
  AND token = 'Nmr6DAju+LvhbojkbZZM6w7lSJ56ee9FpymowPB8SBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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