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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f93cc23883b0517f13b3dc8b201532c61e982fc82945538d8ae76f7f51f86e1' 
  AND token = 'EIUnRzekPPrWUrjbmT2blbKKTF6AXmC1uhXvt35AC4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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