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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c68f6deb636d912bfab8a5d0c04eb6f12a4ab5966e2eb5e946764106d0d666f3' 
  AND token = 'Bu3Mumqt9vvh2F4Bl0adIP6jfoVLIQ97PIMPmlgGTpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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