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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a1418c1ca12838552a483f0c0166aea246993a84b076a533663651874bc382f' 
  AND token = 'llmXJmGpdkWDSfhA8fjkBaNkx0XmlSVkXPVyJOH6c7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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