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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a96f162ac943c421b52f7e6ea62d7732ad1e4d54addede4616812765f5bb3cfa' 
  AND token = 'M6wRqQ9yeAoy7i5N/9wzotxL81eW0RLFsk972+cExBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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