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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e6a4daf239ae2d25ddf68d493c90a731450805c9f68c5c58cab92cf0deb1406' 
  AND token = 'IgJsplFGJlP/AC1Dv5Tw4tVgytdIfzTDCbsqTS145CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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