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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24eac7d5252773bc8dcc525c4cccd9c72a4f69bb212c7c1412ae8e5c3caf0dc4' 
  AND token = 'NQW9/l9WqsnkZE1aBJJuR56nkdWK+ZFEJbXRsoAUYJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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