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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a4f966a63440b2e7932da1818217c86e4659092c0bd6c9a57928cc45ddb63b7' 
  AND token = 'x3tmGZYw0C9cbUH73b5Un9LWRD+kfmlg9+wpy9Cpgzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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