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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aceac07e8ad12d6ce51ef6b485bd68041583b0f6ae540e6373d58135cb872e1d' 
  AND token = 'KrWy+in6EFhUtHw6PpGgUL7SCMA7APJVrAd3XP7tV8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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