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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3960e5161a1fa72f2764c346e0fee2a420962c56035edf6a6bae24c2c310500f' 
  AND token = 'lzr871fyb47XdcqPjr6joUIOe4RxOe2sSfLkjvzzXT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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