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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c554b35b83c490abea0a19d9bdc82945d8e5c91df8c9539b30a33da4d0594646' 
  AND token = 'VW+sbXSCWgoFWVxXvhJGSW2PmPBlS8jdcd4K+amoKHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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