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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3823d1f723e51d392506a0d61f65f4db5ca55c211ffa554d02a91f5b0aeb0a63' 
  AND token = 'nuy10+XaBlPgrY0iifRooTeMXNsfl0rGohhdGJPdJkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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