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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a5b5e9c669f7739b32912296a0dce145b17b7f0aab397d7873a0d7de8c4f9ca' 
  AND token = '2YT6N4q6R01YL/pt79OcQKH303zxiOHv8CmVDjBOLD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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