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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39c24fd1434a439d189c78725b7ea6a7aa67aee96ae5b2230158d68a4fd54b2c' 
  AND token = 'Xv1g852cQW4ytAb4DPVBtI6dYilzcLgVYFCm7VnuZSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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