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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43928544d9b8dee1f27669eec913dd9c801ac42daf2422670941f0c51f827c60' 
  AND token = 'dQORxga6o0CGCG/6CtRFd0HNDmo5TbRyoak879MHQ5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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