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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46e5e6d30070d1fcaf0e099cf78a3c1f44df2b401c2bc831de1245da56fc0720' 
  AND token = 'yBCBfuVdPHfU8ZTJ6ESX2AgJCdYOWbotKdK0fDwEU+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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