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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2015eb0977d1964bb0d27ca3f74b61d6fc61ebffa89bd180679b38a4fa97c095' 
  AND token = 'I8Hzx4wC8jX++Hut0CoSl7apxYETWbEljQhP83jmEx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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