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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bdb0772475ea39640e2be220b02a89ecef42d9a8cd40a0ca05128e9b4140871' 
  AND token = 'hmFulbmCMzV9nFAH1yZ/5K43CYOqsGUEm9OHYZ0Yi8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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