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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d72a3a02cdaefc4b964e112b1dc0d1ed0e818f59455399e45d6df386b13f769' 
  AND token = 'P94aiU8u5fv6UhOMPn4d0jE29XBcBMCUiidXgMCj81I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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