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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dbfef4c5926d82cfcff6158f4add55700b23262620a2aec77d5c05375c392ed' 
  AND token = 'M6PrDLYIWmkQZf5lscuIP646WLJH0mPrf01TFcsNGYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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