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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d49595bee7c2d7d99043d337b5820d4a2ecaa0c3ae440148ad180a91a07f71d' 
  AND token = 'kaVKNZq58jk+PAX7vuUzC8KmY1STImPVabZtkixysg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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