SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0655c2df05b13deb294d04b0be974c7748e5a1c31e0ef970b42f2a5e055f558d' 
  AND token = 'nDw/phDMq8Vp/J91R98IvK+S+r9UdbfzwPkT0238CYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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