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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf94f3dfd0a600a6e6c0e846369e64a5b197e4dcfefcc4f72fa7450faae4ea36' 
  AND token = 'YINczbuwq8P3nINItWauRoo+hyG1I4tT13oq9wSwgiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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