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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb0ead1e1d3ad38284ddc4be3e972185d9bc2ca6cc2454081131fa91f496eca2' 
  AND token = 'TwEXQu/S4DnEzhvzRxj1Xj7kv6g3f7AfgIaH7MhSL7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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