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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f30edcd26f845702245a6ddb02b23ab8016d12d45831b2a03ae00b9320434b4' 
  AND token = 'gfpTinQoPswZJ7AXtzwDp+oQNLnSFJGfz/kHS0uNzL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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