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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89f847d588e7fbe2a489a8d8e0f7f609f77d3de11de135a01b7b0774080ce339' 
  AND token = 'hqUGdgPmfQToKU11285VxZEGosPLLA/dxGGCKlROVMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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