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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6879388a9f28079d4e6fd8028eb0a39dee3fdedf06a602eda4eeacadc3d5b6c2' 
  AND token = 'gtJQiK5p/KRxeOYv6grlUKcMGE4Atfts5vQ04SNJLrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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