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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02fb8223f31c0b1882619fa2512c15ea20993b0d01e51291eceac6d2a943ff33' 
  AND token = '7o5uz2ar+RazTVWH5tMixYhEdk8jrRbCtcRVob/ftfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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