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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5475632d1ea2668dc810671ff9b3a11195e6f679ae708c54a7176ac6f1cd15d1' 
  AND token = 'HwAupbrlH3FgSgZhYpi623r7reTK/+DWjXJhSHOrpmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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