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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd349cf17eca6ac34a451098cf6cc614c475054d0a929b96ad24a15d638ca92f' 
  AND token = 'do9A7A07MEAj7kydvqJOs2Qgk8yZz9uBh48s9roPL0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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