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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '759a0ceded6edbab5e508ff884ef3ddac2cbad6aa954c6f157c47f82d400e245' 
  AND token = 'hGfxjEX+knwEdrYdLjXTstYjm6axeQLornon+Mrr+n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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