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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5ff5ddf054ce39317379bd029246c4731a1152d3a9d4fd4177bb54c70ab7684' 
  AND token = '0aQFSl2s34i32egni+QMWPUt8GLPEWIwpFnYH3exgLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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