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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fce258f8b637c1fd9baad483aa417300d232faed8e93fbedc070922325ccd6dc' 
  AND token = 'R86FAaHdGBDSj36rlu5WmDmmJ7OcmAXhBxF32SFRBBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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