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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57a43adf2a29869aec49a254ffa02321c1c192a4a90611ff81e3e355d569423f' 
  AND token = 'xo04FIdd5Y8EnSXLAJ4DNPzuIg1VwVc1P2a/WkXnxos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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