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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8978e78d3d4f5ab6e488d12f5e39d87f836a847464d2aa8c0cbdede4d885db46' 
  AND token = 'jAMW0H6ADBseZx40jZH44m45UulAQO/l5e9pTXRTBYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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