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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '79710ce9bd8bd69b36269f50c92232bbb0f0a2776eef16e9876f999c9118f1cf' 
  AND token = 'QIURMoraPU1aCDXOB4LrN649E9/pwdWb6+tEFjXHTXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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