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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70fd5307fd9146b8a38e4d730faee3ff1b786a445a4a392e1ad30a457f9e3771' 
  AND token = 'p78RVk+7NkpwCjm+Lu2K0esaug/Tt4o11Mr2S4hWf6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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