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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ada1ecf5dd7fb749fe9e164c63a828808da1b949cc7da0087182d889ac189e67' 
  AND token = 'qN5DoOcga2DWkLY3kVxeWDFiMF2eMpaJdZbeASRD1DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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