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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d6e6dd719f1cff7f9367dd1ae2325ea8cf8aa1f7ae98210844e313a2a632607' 
  AND token = 'AbTaqTJH8r5Oo2GJs0U4eHj1Z8vKDNBVf13bt1rxCGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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