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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56899b355f83c6d564ee620dc057f450a958e72c8e3765ed6965a946930f7473' 
  AND token = 'GiPUDb6Jo3QT/Haddsi1wI3h+N1Aa4P9H+z56I5eJp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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