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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f7f6cf424b71589d48c7957aef2e99d59bae9e3d82b1bd1cb8c6b74050b0e26' 
  AND token = '8pOlbBKobEWXC7b2QjuHrJoaPLtKRWp1M/PMITPBeE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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