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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa8d8b26e398b4fc592fe2edef835a836d2e4d68f0f57ba805547eaa5b2dc518' 
  AND token = 'LukNlOXjw52IeUljEyxiBJ6CATW8AkWOazzxrnRTyrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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